128959992100 has 27 divisors (see below), whose sum is σ = 279850975761. Its totient is φ = 51582560400.

The previous prime is 128959992023. The next prime is 128959992127. The reversal of 128959992100 is 1299959821.

The square root of 128959992100 is 359110.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 46425597156 + 82534394944 = 215466^2 + 287288^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3573145 + ... + 3609055.

Almost surely, 2^128959992100 is an apocalyptic number.

128959992100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128959992100 is the 359110-th square number.

It is an amenable number.

128959992100 is an abundant number, since it is smaller than the sum of its proper divisors (150890983661).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128959992100 is an frugal number, since it uses more digits than its factorization.

128959992100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71836 (or 35918 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 55.

The spelling of 128959992100 in words is "one hundred twenty-eight billion, nine hundred fifty-nine million, nine hundred ninety-two thousand, one hundred".